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人体的基本组成单位是细胞,成千上万的细胞组成了组织器官和系统,要使所有细胞协调一致地工作,从而保证整个机体的正常运行,细胞与细胞之间存在着这样一类化学物质,它的功能是在细胞间和细胞内传递信息。
The basic unit of the human body is the cell. Thousands of cells constitute the tissues, organs, and systems. All cells must work in harmony to ensure the normal operation of the whole body. There exists such a chemical substance between cells and cells. Its function is to transmit information between cells and cells.